package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

@Slf4j
public class RefreshTokenInterceptor implements HandlerInterceptor {

    private StringRedisTemplate stringRedisTemplate;
    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //1.获取请求头中的token
        String token = request.getHeader("authorization");
        if (StrUtil.isBlank(token)){
            return true;
        }


        //2.基于token获取redis中的用户
        Map<Object, Object> userMap = stringRedisTemplate.opsForHash().entries("login:user:" + token);

        //3.判断用户是否存在
        if (userMap.isEmpty()) {
            return true;
        }
        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);

        //4.用户存在，保存用户信息到ThreadLocal
        UserHolder.saveUser(userDTO);
        stringRedisTemplate.expire("login:user:" + token, 365, TimeUnit.DAYS);

        return true;
    }
}
